Question

find the cost of painting 15 cylindrical Asaf building at rate 2.50 per square metre if the diameter and height of each pillar is 48 cm and 7 m respectively
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Answer 1

Answer:

Given

Diameter=48cm

radius= (d/2) =48/2=24cm=24/100m=.24m

height=7

Step-by-step explanation:

c.s.a area of cylinder = 2πrh

                                   =2×22/7×.24×7

                                   =2×22×24/100      

                                 = 88×24/100

                                  =21.12cm²      

area of 15 such buildings =21.12×15=316.8cm²

cost of painting = 316.8×2.50= Rs.792 Ans.